• The air will come in through smaller chimney

• In the ideal case pressure in the box would be

diminished until: ¾ The candles go out ¾ It gets equalized through both chimneys

• The prevailing chimney cannot be determined

a priori• Imperfections in the apparatus cause one chimney to drag moreEqual height andcross-sections Conclusion

• We can say that the observed effect of flame

instability has two causes: 1. Difference in pressures 2. Difference in flows throuh the chimneys• In some cases it is impossible to say which flame will become unstable, but in other we can predict that with great security